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nvd[email protected]NVD:CVE-2023-38545
HistoryOct 18, 2023 - 4:15 a.m.

CVE-2023-38545

2023-10-1804:15:11
CWE-787
web.nvd.nist.gov
5
cve-2023-38545
buffer overflow
socks5 proxy
handshake
heap buffer
curl
url
security vulnerability

CVSS3

9.8

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

AI Score

9.7

Confidence

High

EPSS

0.003

Percentile

70.6%

This flaw makes curl overflow a heap based buffer in the SOCKS5 proxy
handshake.

When curl is asked to pass along the host name to the SOCKS5 proxy to allow
that to resolve the address instead of it getting done by curl itself, the
maximum length that host name can be is 255 bytes.

If the host name is detected to be longer, curl switches to local name
resolving and instead passes on the resolved address only. Due to this bug,
the local variable that means β€œlet the host resolve the name” could get the
wrong value during a slow SOCKS5 handshake, and contrary to the intention,
copy the too long host name to the target buffer instead of copying just the
resolved address there.

The target buffer being a heap based buffer, and the host name coming from the
URL that curl has been told to operate with.

Affected configurations

NVD
Node
haxxlibcurlRange7.69.0–8.4.0
Node
fedoraprojectfedoraMatch37
Node
netappactive_iq_unified_managerMatch-vmware_vsphere
OR
netappactive_iq_unified_managerMatch-windows
OR
netapponcommand_insightMatch-
OR
netapponcommand_workflow_automationMatch-
Node
microsoftwindows_10_1809Range<10.0.17763.5122
OR
microsoftwindows_10_21h2Range<10.0.19044.3693
OR
microsoftwindows_10_22h2Range<10.0.19045.3693
OR
microsoftwindows_11_21h2Range<10.0.22000.2600
OR
microsoftwindows_11_22h2Range<10.0.22621.2715
OR
microsoftwindows_11_23h2Range<10.0.22631.2715
OR
microsoftwindows_server_2019Range<10.0.17763.5122
OR
microsoftwindows_server_2022Range<10.0.20348.2113

CVSS3

9.8

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

AI Score

9.7

Confidence

High

EPSS

0.003

Percentile

70.6%